Brookfield DV2+Pro Viscometer Manual do Utilizador descarregar pdf (Página 22)

Brookeld Engineering Labs., Inc. Page 22 Manual No. M03-165-F0612

The DV-II+Pro may be set to stand alone mode by turning it OFF and ON again and selecting “Stand

Alone” or by removing the DVP-80 cable prior to turning the DV-II+Pro on.

Note: The DV-II+Pro cannot communicate with DVLOADER software in

the external control mode. Choose “Stand Alone” when presented

with Figure II-23 if you want to use DVLOADER.

For information on controlling the DV-II+Pro from Rheocalc software, check the HELP menu

within Rheocalc.

II.10 Making Viscosity Measurements

 Thefollowinggeneralprocedureisusedformakingviscositymeasurements.Brookeldrecommends

theuseofa600mlLowFormGrifnbeaker(BrookeldPartNo.BKR-600ml)whenusingLV/

RV/HA/HB spindles.

1. Mount the guardleg on the DV-II+Pro Viscometer (LV and RV series) and insert into the container.

 2. Insertandcenterspindleinthetestmaterialuntiltheuid’slevelisattheimmersiongroove

onthespindle’sshaft.Withadisc-typespindle,itisnecessarytotiltthespindleslightlywhile

immersing to avoid trapping air bubbles on its surface.

A) If you have a standard viscometer, attach the spindle to the coupling nut on the

lowershaftof the viscometer. Lifttheshaft slightly,holdingit rmly with one

handwhilescrewingthespindleonwiththeother(note:left-handthread).Avoid

putting side thrust on the shaft. Verify the proper spindle immersion depth and that

the viscometer is level.

B) If you have an EZ-Lock viscometer, with one hand hold the spindle, while gently

raising the spring-loaded outer sleeve to its highest position with the other hand, as

shown in Figure II-7. Insert the EZ-Lock Spindle Coupling so that the bottom of

thecouplingisushwiththebottomoftheshaft,andlowerthesleeve.Thesleeve

should easily slide back down to hold the spindle/coupling assembly in place for use.

3. Theprocessofselectingaspindleandspeedforanunknownuidisnormallytrialanderror. An

appropriate selection will result in measurements made between 10-100 on the instrument

% torque scale. Two general rules will help in the trial and error process.

1) Viscosity range is inversely proportional to the size of the spindle.

2) Viscosity range is inversely proportional to the rotational speed.

To measure high viscosity, choose a small spindle and/or a slow speed. If the chosen spindle/

speed results in a reading above 100%, then reduce the speed or choose a smaller spindle.

Experimentation may reveal that several spindle/speed combinations will produce satisfactory

results between 10-100%. When this circumstance occurs, any of the spindles may be selected.

  Non-Newtonianuidbehaviorcanresultinthemeasuredviscositychangingifthespindleand/

or speed is changed. See our publication, “More Solutions to Sticky Problems,” for more detail.

Turn on motor.

Allow time for the indicated reading to stabilize. The time required for stabilization will depend

onthespeedatwhichtheViscometerisrunningandthecharacteristicsofthesampleuid.For

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